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Applications of Integration to Find Hydrostatic Pressure01:30

Applications of Integration to Find Hydrostatic Pressure

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Hydrostatic force is a fluid's total force at rest on a surface. For a horizontal surface submerged at a fixed depth, the pressure is constant and calculated as the product of fluid density, gravitational acceleration, and depth. In the case of a vertical dam wall submerged in water, this force is not evenly distributed due to the increasing pressure with depth. This variation arises from the cumulative weight of the water above each point. Integration is used to account for the continuous...
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Hydrostatic Pressure Force on a Plane Surface01:04

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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
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Hydrostatic Pressure Force on a Curved Surface01:04

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
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When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
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Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique
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Mecanoquímica controlada estéricamente bajo presión hidrostática

Hao Yan1,2, Fan Yang1,3, Ding Pan4,5,6

  • 1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.

Nature
|February 23, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron "embudo molecular" para desencadenar reacciones químicas usando presión hidrostática. Este avance permite la mecanoquímica bajo compresión, abriendo nuevas vías para la síntesis de materiales específicos y las transformaciones químicas.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química
  • Mecanoquímica

Sus antecedentes:

  • Los estímulos mecánicos pueden alterar las vías de reacción química, ofreciendo una estrategia sintética complementaria a la química convencional.
  • Los estudios mecanoquímicos anteriores se centraron en las fuerzas de tracción u ortogonales, limitando las aplicaciones bajo presión hidrostática.

Objetivo del estudio:

  • Para demostrar la mecanoquímica impulsada por la compresión isotrópica (presión hidrostática).
  • Diseñar estructuras moleculares que traduzcan el estrés isotrópico en tensión anisotrópica para la activación de enlaces.

Principales métodos:

  • Ingeniería molecular de estructuras con componentes mecánicamente heterogéneos (mecanoforos compresibles y ligandos incompresibles).
  • "Capacidad" igual o superior a 10 kW y con un rendimiento superior o igual a 10 kW, pero no superior a 10 kW.
  • Combinando enfoques experimentales y computacionales.

Principales resultados:

  • Se han demostrado reacciones redox impulsadas por la presión hidrostática en calogenuros orgánicos metálicos.
  • Se ha demostrado la activación de enlaces metal-calcógeno a través de tensiones anisotrópicas inducidas por yunques moleculares.
  • Se observa la formación inducida por presión de metal elemental a través de la flexión del ángulo de unión o el corte de la cadena.

Conclusiones:

  • La mecanoquímica es alcanzable bajo compresión isotrópica mediante el diseño de moléculas con compresibilidad heterogénea.
  • Los yunques moleculares proporcionan un mecanismo para traducir la presión hidrostática en la activación de enlaces específicos.
  • Este trabajo revela un nuevo mecanismo de reacción y sugiere estrategias para la mecanosíntesis de alta especificidad.